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PHP

Name

— The name of the cookie

Value

— The value of the cookie

Expires

— The date when the cookie expires

Path

— The path for the cookie

Domain

— The domain for the cookie

Secure

— A Boolean indicating whether the cookie is secure

Other properties of

HttpCookie

are used when cookies store multiple values, but since those cookies

won’t work in concert with the JavaScript code in this chapter, they are not listed here.

To read a cookie, you can access it by its name in the

collection:

Dim cookie as HttpCookie

Dim cookieValue as String

cookie = Request.Cookies(“name”)

cookieValue = cookie.Value

This example reads a cookie with the name

“name”

and assigns the value to the variable

cookieValue

To create a new cookie, create a new instance of

HttpCookie

and pass the name and value to the construc-

tor. Then, you set any other properties for the cookie before saving it with a call to

Response.SetCookie()

Dim cookie as HttpCookie = New HttpCookie(“name”, “Nicholas”);

cookie.Expires = #1/1/2006#;

Response.SetCookie(cookie);

Note that the

Expires

property expects a

DateTime

object, not a numeric value as in JSP.

To delete a cookie, just set the

Expires

property to a date in the past:

cookie.Expires = DateTime.Now.addDays(-1);

PHP

PHP’s cookie functions are very straightforward, as is most of the PHP language. To create a cookie,

PHP provides a

setcookie()

function that takes the same arguments as the JavaScript

setCookie()

function described in this chapter. The main difference is that the expiration date is specified as a num-

ber, just as it is in JSP:

bool setcookie ( string name [, string value [, int expire [, string path

[, string domain [, bool secure]]]]])

Calling the function is very easy:

<?php

setcookie(“name”, “Nicholas”);

setcookie(“book”, “Professional JavaScript”);

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Client-Server Communication

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